v3.26.3
Related Party Transactions (Debt Payable to Related Parties) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]          
Interest expense—Westlake $ 5,110 $ 5,947 $ 15,314 $ 17,391  
Affiliated Entity          
Related Party Transaction [Line Items]          
Accrued interest on related party debt 5,110   5,110   $ 5,508
Affiliated Entity | Westlake          
Related Party Transaction [Line Items]          
Interest expense—Westlake 5,110 $ 5,947 15,314 $ 17,391  
Accrued interest on related party debt 5,110   5,110   5,508
Long-term debt payable to Westlake $ 399,674   $ 399,674   $ 399,674